Business Combination Disclosure [Text Block] (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Mar. 24, 2017
Revenues		$ 82,237	$ 77,696		$ 154,077	$ 153,591
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		14,307	$ 4,637		$ 19,316	$ 120,303
PetPartnersIncAcquiree,Member
Business Acquisition, Percentage of Voting Interests Acquired							85.00%
Business Combination, Consideration Transferred	$ 12,713
Goodwill, Acquired During Period	$ 9,124
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles							$ 5,880
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value							2,005
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net							$ 5,594
Revenues		1,339		$ 1,453
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ 72		$ 87